Instrumental development for measuring sorption properties of porous materials

Navas, Francisco Javier; Gallardo, Juan Jesús; Edreira, MaCarmen; Martín, Joaquín
June 2006
Review of Scientific Instruments;Jun2006, Vol. 77 Issue 6, p065107
Academic Journal
An instrumental system for the continuous measuring of sorption properties in porous materials is described. This system constitutes a qualitative and quantitative improvement over the referenced methodologies applicable to this type of measurement. In this work, the function of the main components of the system is described, placing special emphasis on the electronics used for controlling the transducer and actuator devices. The system has been fully computerized with specific software whereby variables such as the weight, the temperature, the relative humidity, the aqueous levels, etc. can be continuously controlled. Finally, a set of representative experiments undertaken with this instrumentation is presented, highlighting the main experimental characteristics.


Related Articles

  • Acoustical measurements of the trapping constant of porous material. Debray, Alexis; Allard, Jean F.; Lauriks, Walter; Kelders, Luc // Review of Scientific Instruments;Dec1997, Vol. 68 Issue 12, p4462 

    Presents a method of acoustically measuring the trapping constant of porous materials saturated by air. Evaluation of the trapping constant from acoustical measurements of the imaginary part of the compressibility of the saturating air at low frequencies; Performance of measurements on random...

  • Measurement of small electrical forces using a torsion balance and capacitive position transducer. Winkler, L. I. // Review of Scientific Instruments;Dec1986, Vol. 57 Issue 12, p3019 

    A method for measuring the force arising from the attraction between a charged electrode and another electrode on which charges have been induced has been developed using a torsion balance operated in the ac mode far above the resonance frequency of the balance. The movement of the balance is...

  • Fluid density measurement using transducers based upon loudspeaker technology. Blake-Coleman, B. C.; Fryer, P. // Review of Scientific Instruments;Dec1991, Vol. 62 Issue 12, p3068 

    By selecting particular types of currently available plastic coned miniature loudspeakers, and appropriately configuring each device with a suitable closed oscillatory circuit, it is possible to construct a liquid density transducer. Whereas current resonant densitometers operating in either the...

  • Measurement of impulse response of force transducers. Fujii, Yusaku // Review of Scientific Instruments;Jul2001, Vol. 72 Issue 7, p3108 

    Impulse responses of force transducers are measured. An object levitated with sufficiently small friction using a pneumatic linear bearing is made to collide with a force transducer under test. The inertial force acting on the object is measured as the product of the mass and the acceleration....

  • Capacitive angle sensor with infinite range. Peters, Randall D. // Review of Scientific Instruments;Mar93, Vol. 64 Issue 3, p810 

    A variant of the linear rotary differential capacitance transducer has been used to build an angle sensor which is essentially linear over an infinite range, while maintaining microradian resolution. This capability is realized by ganging two of the transducers on a common axle, in quadrature....

  • A linear actuator with 3 Ã… closed-loop control resolution and 50 mm travel range (abstract). Shu, Deming; Han, Yufeng; Toellner, Thomas S.; Alp, Esen E. // Review of Scientific Instruments;Mar2002, Vol. 73 Issue 3, p1583 

    We have designed and constructed a novel linear actuator with 3 Ã… closed-loop control resolution and 50 mm travel range. Two major ultraprecision motion control techniques have been applied to this actuator: (i) a novel laser Doppler encoder system with multiple-reflection optics [D. Shu et...

  • Structural and dielectric properties of ferroelectric Sr5RTi3Nb7O30 (R=Nd and Y) ceramics. Fang, L.; Zhang, H.; Yang, J. F.; Meng, F. C.; Yuan, R. Z. // Journal of Materials Science Letters;Dec2003, Vol. 22 Issue 23, p1705 

    The article informs that the need for various electric devices, such as transducers, actuators, capacitors and ferroelectric random access memory application, has greatly stimulated the investigation on ferroelectric niobates in tungsten-bronze (TB) family due to their interesting ferroelectric,...

  • Parameter Optimization of a Silicon Pressure-Sensitive Element Based on Dual-Drain MIS Transistors. Babichev, G. G.; Kozlovskiı, S. I.; Romanov, V. A.; Sharan, N. N. // Technical Physics;Feb2001, Vol. 46 Issue 2, p254 

    The object of investigation was an integrated pressure transducer with a differential pressure-sensitive element based on two parallel-connected p-channel dual-drain MIS transistors. The transistors were made on the planar side of a silicon membrane with the rigid central region near the edges...

  • Liquid-to-gas differential pressure transmitter with small hydrostatic error. McWhirter, J.D.; Crawford, M.E.; Klein, D.E. // Review of Scientific Instruments;Dec1997, Vol. 68 Issue 12, p4569 

    Describes a design for a device which transmits steady-state pressure from a liquid process to a gas differential pressure signal. Hydrostatic error inherent in liquid-to-gas pressure transmission; Modification of the 'gas trap' method of pressure measurement; Applicability of the design to a...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics